PREFACE. 



THE writer's Manual of Bacteriology, published in 1892, has been 

 very favorably received both in this country and abroad, but its use- 

 fulness has no doubt been to some extent restricted by the size and 

 expense of the volume. The following is an extract from the preface 

 of the Manual : 



" A Manual of Bacteriology, therefore, which fairly represents the 

 present state of knowledge, will consist largely of a statement of facts 

 established by experimental data, and cannot fail to be of value to 

 physicians and to advanced students of bacteriology as a work of 

 reference. The present volume is an attempt to supply such a man- 

 ual, and at the same time a text-book of bacteriology for students 

 and guide for laboratory work. That portion of the book which is 

 printed in large type will, it is hoped, be found to give an accurate 

 and sufficiently extended account of the most important pathogenic 

 bacteria, and of bacteriological technology, to serve as a text-book for 

 medical students and others interested in this department of science. 

 The descriptions of non-pathogenic bacteria, and of the less important 

 or imperfectly described species of pathogenic bacteria, are given in 

 smaller type." 



For the benefit of students of medicine and others who do not care 

 especially for the detailed descriptions of non-pathogenic bacteria and 

 the extensive bibliography contained in the Manual, this TEXT-BOOK 

 OF BACTERIOLOGY is now published. It comprises that portion of the 

 Manual above referred to as printed in large type, revised to include 

 all important additions to our knowledge of the pathogenic bacteria 

 since the original date of publication. 



